Tuatara appears 200,000,000 years ago, and boil the skull having top eyes now, and the life is a kind more than 100 years. It resemble a lizard, but the structure of the body is considerably different. It is nocturnal and prey on insects. Activity is possible even as for around 10 degrees, temperature is oviparous, but needs one year though an egg hatches. Tuatara is called "a living fossil" with the most original reptiles, and the actual species inhabits the New Zealand with both kinds only with two kinds. It was distributed all over the world, but it is thought that the condition of an unsociable solitary island prevents the invasion of a foreign enemy and the rival and survived once. A domestic animal and a mouse were carried with human emigration, and environment changed suddenly, and a crisis of the extinction extended. A study is pushed forward, and the cause under the protection that it is attracted in the island where the foreign enemy does not live in by a law, and is severe, the number of the habitation are stable to a little over 10,000 now.